Silver diamine fluoride: what the trials say about arrest, intervals and staining
Arrest rates against placebo and fluoride varnish, how often to reapply, root caries in older adults, potassium iodide and the black stain, and what parents and older patients accept, from the randomised trials and guidelines behind 38% SDF. Every figure below is taken from the cited source — nothing is estimated or interpolated.
Clinically reviewed by Chithra Durgam, DDS on .
54% vs 23%
lesions arrested at 6 months with one application of 38% SDF versus placebo in 830 US children with severe early childhood caries; 50% versus 17% at 8 months after two applications [2026]
98% vs 72%
arrest after two applications given 1 month apart versus 6 months apart in children with cavitated primary-tooth lesions; 4-month spacing reached 96% [2024]
OR 1.41
odds of arrest with SDF versus sodium fluoride varnish for early childhood caries across nine randomised trials (95% CI 1.03–1.94) [2026]
90% vs 45%
root caries lesions arrested after 30 months of annual SDF versus placebo in community-dwelling elders; adding potassium iodide gave 93% and did not reduce the staining [2016]
The silver diamine fluoride table
What each question was measured on, what the evidence found, and the verdict, with a source year for every line. Rows with a linked answer open the full cited answer.
| Question | What was measured | What the evidence says | Verdict | Source |
|---|---|---|---|---|
| Does SDF arrest cavitated caries in primary teeth? | 830 children aged 1–6, 38% SDF vs placebo, lesions arrested | Arrest was 54% at 6 months with one application and 50% at 8 months with two, against 23% and 17% with placebo. Pain and treatment-related adverse events did not differ between arms. | Yes, in young children | 2026 |
| What arrest rate should I quote? | Meta-analysis of 1,205 cavitated primary-molar lesions; review of 20 trials | About half of cavitated lesions arrest with annual or biannual 38% SDF (51.6% pooled), more with biannual application. Across 20 randomised trials the rate ranged from 25% to 99% depending on lesion stage, frequency and follow-up. | About half, more with repeats | 20222024 |
| SDF or fluoride varnish for cavitated lesions? | Nine trials pooled; 12-month split-mouth trial on interproximal lesions | SDF gave higher odds of arrest than varnish across nine trials (OR 1.41, 95% CI 1.03–1.94). On interproximal lesions in primary molars 76% arrested at 12 months with biannual SDF against 47% with varnish, with the advantage concentrated in lesions that had reached dentine.Full clinical answer | SDF, once in dentine | 20262025 |
| SDF or varnish for enamel-only lesions? | 290 children aged 1–3, semiannual SDF vs varnish, 18 months | Arrest was 59.1% with SDF and 58.8% with varnish (p = 0.873). Baseline lesion extent, tooth position and brushing with fluoride toothpaste predicted arrest; the agent did not.Full clinical answer | No advantage on enamel | 20222024 |
| How often should I reapply? | Trial of two applications 1, 4 or 6 months apart; ADA guideline; Cochrane | Two applications 1 or 4 months apart arrested 98% and 96% of lesions; 6 months apart arrested 72%. The ADA recommends biannual 38% SDF for advanced cavitated lesions, and the AAPD protocol is to check at 2–4 weeks, reapply what is not hard, then recall every 3 to 6 months by risk.Full clinical answer | Twice yearly, sooner while active | 20242018 |
| When do I stop reapplying? | 2026 time-bound SDF framework built on AAPD guidance | Follow up within 3–6 months; reapply when a lesion is not arrested, risk stays high or activity continues; stop at confirmed arrest, a definitive restoration or exfoliation. These are good-practice statements on very low-certainty evidence.Full clinical answer | Until hard, restored or exfoliated | 2026 |
| Does potassium iodide stop the black stain? | 83 elders randomised to annual SDF, SDF plus KI or placebo, 30 months | Arrest was 90% with SDF and 93% with SDF plus KI, and the colour of arrested lesions did not differ: the KI step did not reduce long-term blackening. In vitro, only repeated daily KI or glutathione held discolouration down.Full clinical answer | Not in the long run | 20162025 |
| Does SDF work for root caries in older adults? | Three Hong Kong elder trials, 83–323 participants, 24–36 months | Annual SDF arrested 90% of active root lesions versus 45% with placebo, and with 6-monthly oral-health education cut new root-caries surfaces to 0.70 versus 1.33. In institutionalised elders annual SDF (0.7 new surfaces) matched quarterly varnish (0.9) against 2.5 with instruction alone. Cochrane rates the prevention effect as moderate certainty.Full clinical answer | Annual application works | 20162024 |
| Hypersensitive cavitated lesions in young children? | 30 children aged 2–5, SDF plus KI vs varnish, 3 months | Both cut parent-rated pain, SDF plus KI to 0.4 versus 1.4 on a 10-point scale, and arrest at 3 months was 87% against 13% with varnish. Not randomised, 15 per group, 3 months of follow-up. | Works, small cohort | 2023 |
| Will parents accept it? | 217 parents in UK and US clinics, questionnaire with photographs | About 73% would accept SDF on back teeth and 58% on front teeth in both countries. Concern about appearance was what lowered acceptance, so lead the consent conversation with the stain and the tooth position. | Most say yes for back teeth | 2024 |
| Will older patients accept it? | 485 adults over 62 treated with SDF or ART, surveyed at 52 weeks | 97% were satisfied overall and over 90% with effectiveness, ease and lack of side effects; participants said they would choose a non-surgical option over drilling or injections.Full clinical answer | Near-universal satisfaction | 2026 |
| Where do the guidelines stand? | ADA 2018, AAPD 2017 and EAPD 2022 recommendations | The ADA names 38% SDF among its most effective nonrestorative options and recommends biannual application for advanced cavitated lesions in primary teeth. The AAPD gives a conditional recommendation within a caries-management plan. The EAPD rates the primary-dentition evidence as strong, with better outcomes for biannual application. | Recommended by all three | 20182022 |
| Off-label use and consent? | UCSF protocol on rationale, indications and consent | The FDA cleared SDF for sensitivity; caries arrest is off-label and, the authors argue, permissible and appropriate. The consent script covers the permanent black stain on treated lesions, temporary skin or mucosal staining and the need for repeat applications. | Off-label, with a consent script | 2016 |
How to use this table
- Quote arrest as a range and name the lesion stage: roughly half of cavitated lesions with one or two applications, up to 98% when two applications are a month apart, and no advantage over varnish on enamel-only lesions.
- Plan the recall before the first application: check at 2–4 weeks, reapply what is not hard, then every 6 months at least while the patient remains high risk.
- Tell parents the stain is permanent on the treated lesion and that potassium iodide does not remove it in the long run; most accept SDF on back teeth, far fewer on front teeth.
- For older adults with root caries, annual application is the tested regimen and matched quarterly fluoride varnish in institutionalised elders.
- Caries arrest is an off-label use of an FDA-cleared desensitiser; document consent, including the discolouration, and the plan for a definitive restoration where one is intended.
- Use the handout action below to prepare an explanation for your patient, then review the generated wording against the cited evidence before using it.
How this brief was built
Every row reports the cited trial, review or guideline's own result for its own population and lesion stage. Arrest means the lesion the study treated was hard on probing at the stated follow-up, and each row names that follow-up because arrest rates rise with repeat applications and fall as lesions deepen. Where a row rests on a guideline whose full text is not openly licensed (the ADA and AAPD guidelines), the recommendation is quoted from its PubMed abstract or from an open-access paper that restates it, and the row says so. Nothing on this page is a manufacturer figure.
Cited sources
Where every figure comes from
Efficacy of Silver Diamine Fluoride on Young Children With Severe Early Childhood Caries: A Randomized Clinical Trial
JAMA Pediatrics · 2026 · Randomised placebo-controlled trial
Open the sourceAn open-label, parallel-group, randomized clinical trial of different silver diamine fluoride application intervals to arrest dental caries
BMC Oral Health · 2024 · Randomised trial
Open the sourceComparative Efficacy of Silver Diamine Fluoride and Sodium Fluoride in Managing Early Childhood Caries: An Updated Systematic Review and Meta-Analysis
International Journal of Dentistry · 2026 · Systematic review and meta-analysis
Open the sourceSilver Diamine Fluoride (SDF) Efficacy in Arresting Cavitated Caries Lesions in Primary Molars: A Systematic Review and Metanalysis
International Journal of Environmental Research and Public Health · 2022 · Systematic review and meta-analysis
Open the sourceThe role of silver diamine fluoride as dental caries preventive and arresting agent: a systematic review and meta-analysis
Frontiers in Oral Health · 2024 · Systematic review and meta-analysis
Open the sourceArrest of interproximal caries lesion in primary molars with 38% silver diamine fluoride solution and 5% sodium fluoride varnish: A randomized clinical trial
Journal of the Indian Society of Pedodontics and Preventive Dentistry · 2025 · Randomised split-mouth trial; abstract assessed
Open the sourceIs Silver Diamine Fluoride Effective in Arresting Enamel Caries? A Randomized Clinical Trial
International Journal of Environmental Research and Public Health · 2022 · Randomised trial
Open the sourceTopical silver diamine fluoride (SDF) for preventing and managing dental caries in children and adults
Cochrane Database of Systematic Reviews · 2024 · Cochrane systematic review; abstract assessed
Open the sourceEvidence-based clinical practice guideline on nonrestorative treatments for carious lesions: A report from the American Dental Association
Journal of the American Dental Association · 2018 · Clinical practice guideline; abstract assessed
Open the sourceUse of Silver Diamine Fluoride for Dental Caries Management in Children and Adolescents, Including Those with Special Health Care Needs
Pediatric Dentistry · 2017 · Clinical practice guideline; abstract assessed
Open the sourceBest clinical practice guidance for treating deep carious lesions in primary teeth: an EAPD policy document
European Archives of Paediatric Dentistry · 2022 · Best-practice policy
Open the sourceEffectiveness of the Non-restorative Cavity Control (NRCC) Approach in Managing Dentinal Caries in Primary Teeth: A Systematic Review
Cureus · 2026 · Systematic review; restates the ADA recommendation
Open the sourceA Time-Bound Clinical Framework for Silver Diamine Fluoride as Interim Stabilization in Severe Early Childhood Caries
Children · 2026 · Clinical framework
Open the sourceMinimally Invasive Therapies for the Management of Dental Caries: A Literature Review
Dentistry Journal · 2021 · Narrative review
Open the sourceRandomized clinical trial on arresting dental root caries through silver diammine fluoride applications in community-dwelling elders
Journal of Dentistry · 2016 · Randomised trial; abstract assessed
Open the sourceSilver diamine fluoride and education to prevent and arrest root caries among community-dwelling elders
Caries Research · 2013 · Randomised trial; abstract assessed
Open the sourceA randomized trial on root caries prevention in elders
Journal of Dental Research · 2010 · Randomised trial; abstract assessed
Open the sourceClinical use of silver diamine fluoride in older adults: A scoping review
Journal of Dentistry · 2025 · Scoping review; abstract assessed
Open the sourceEvaluation of the Caries-Arresting Potential of Silver Diamine Fluoride Gel With Potassium Iodide Versus Sodium Fluoride Varnish: An Observational Study
Cureus · 2024 · Split-mouth observational study
Open the sourceEffect of single and repeated potassium iodide applications versus glutathione on silver diamine fluoride-induced tooth discoloration in primary teeth: An in vitro comparative study
Journal of Dental Research, Dental Clinics, Dental Prospects · 2025 · In vitro study
Open the sourceEfficacy of Different Fluoride Therapies on Hypersensitive Carious Lesions in Primary Teeth
Medicina · 2023 · Prospective double-cohort study
Open the sourceParental acceptability of silver diamine fluoride: The UK and US experiences
International Journal of Paediatric Dentistry · 2024 · Cross-sectional survey
Open the sourceCommunity-dwelling older adults' satisfaction and experiences with two non-surgical caries treatments: a mixed methods study
Frontiers in Oral Health · 2026 · Mixed-methods study within a cluster-randomised trial
Open the sourceUCSF Protocol for Caries Arrest Using Silver Diamine Fluoride: Rationale, Indications and Consent
Journal of the California Dental Association · 2016 · Clinical protocol
Open the source
Ask this against the live evidence.
This brief is a stored snapshot of the published literature. Run the search yourself for sources matched to the case in front of you.
This brief was compiled from the published reviews, guidelines, and trials listed above. Findings reflect each source’s own populations, materials, and test conditions.
Compiled on . Verify against current evidence and apply professional judgment before clinical use.